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Abstract. The air emission data from the National Air Emissions Monitoring Study (NAEMS) was collected from 2007 to 2009 and is used by the U.S. Environmental Protection Agency (USEPA) to determine the regulatory responsibilities of animal feeding operations. The goal of the study is to gather information through comprehensive literature review, survey, and meta-analysis, for an evaluation of the representativeness of air emission data for swine operations under NAEMS relative to emissions from the predominant swine production systems in use today, and to provide scientific evidences for an estimation of the nature and size of the changes in emissions today relative to the NAEMs results. Over the past decade, feed conversion efficiency in the U.S. pork industry have improved continuously due to improved feed formulations, genetics and management practices. For the same amount of animal product, the manure amount and air emissions per unit of animal product are likely reduced by 18% from 2010 to 2019, and could further be reduced with further improvement in feed conversion efficiency. The NAEMS ammonia emission rates for finishing swine houses with deep pit may still be representative in today‘s condition, but the NAEMS data on ammonia emission rates for gestation houses or for pit recharge systems could overestimate emissions by 2 to 4 times higher. As DDGS are increasingly used in practice as a partial replacement for corn-soybean meal to reduce feed cost, the NAEMS hydrogen sulfide emission rates for swine house could underestimate emissions in cases when DDGS diet are used.